Download the NVidia Driver installer for Linux (x86/x86_64 depending on your Salix version) from their homepage by and remember the location you saved it to.
Close your X session:
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init 3
Now change to the directory you downlaoded the driver to:
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cd /my/path/to/installer
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sh NVIDIA-Linux-x86_64-190.53-pkg2.run
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sh NVIDIA-Linux-x86_64-190.53-pkg2.run --update
BTW, I'm sure it would be also possible with nv and xrandr or if you prefer a (less powerful) GUI lxrandr,.
I'm using for presentations on my laptop with Intel graphics a small script invoking xrandr.
xrandr works with most drivers.
Just try xrandr, which should show all available outputs. To clone my laptop screen (LVDS) to an external beamer connected to the VGA port (VGA), I'd run xrandr --output VGA --same-as LVDS.
What you need to invoke depends on the available outputs and you screen configuration, of course.